Usa "jounce" in una frase

1. seat, then began to jounce around

2. He liked sitting there stoned and pretending not to watch her tits jounce around like grapefruits in a sack

3. But those books are now only fifty-pound cartons that jounce around dangerously with every pothole and keep the van from attaining a top speed of more than forty-seven miles per hour